--Первый запрос:
EXEC sp_executesql N'SELECT TOP 23
T1._Date_Time,
T1._Number,
T1._Fld6651,
T1._Fld6643,
T1._Fld6652,
T1._Fld6650,
T1._Fld6649,
T1._DocumentTRef,
T1._DocumentRRef,
T1._Marked,
T1._Posted
FROM _DocumentJournal6640 T1 WITH(NOLOCK)
WHERE (T1._Date_Time >= @P1 AND T1._Date_Time <= @P2)
ORDER BY (T1._Date_Time) ASC, (T1._DocumentTRef) ASC, (T1._DocumentRRef) ASC',

Top(TOP EXPRESSION:((23)))
  |--Nested Loops(Inner Join, OUTER REFERENCES:([Expr1007], [Expr1008], [Expr1009]))
       |--Merge Interval
       |    |--Concatenation
       |         |--Compute Scalar(DEFINE:(([Expr1002],[Expr1003],[Expr1001])=GetRangeWithMismatchedTypes([@P1],NULL,(22))))
       |         |    |--Constant Scan
       |         |--Compute Scalar(DEFINE:(([Expr1005],[Expr1006],[Expr1004])=GetRangeWithMismatchedTypes(NULL,[@P2],(42))))
       |              |--Constant Scan
       |--Clustered Index Seek(OBJECT:([basename].[dbo].[_DocumentJournal6640].[_Document6640_ByDocDate_TR] AS [T1]), SEEK:([T1].[_Date_Time] > [Expr1007] AND [T1].[_Date_Time] < [Expr1008]) ORDERED FORWARD)

-- Второй:
EXEC sp_executesql N'SELECT TOP 20
T1._Date_Time,
T1._Number,
T1._Fld6651,
T1._Fld6643,
T1._Fld6652,
T1._Fld6650,
T1._Fld6649,
T1._DocumentTRef,
T1._DocumentRRef,
T1._Marked,
T1._Posted
FROM _DocumentJournal6640 T1 WITH(NOLOCK)
WHERE ((T1._Date_Time >= @P1) AND (T1._Date_Time <= @P2)) AND T1._Date_Time = @P3 AND T1._DocumentTRef = @P4 AND T1._DocumentRRef > @P5
ORDER BY (T1._Date_Time) ASC, (T1._DocumentTRef) ASC, (T1._DocumentRRef) ASC
OPTION (FAST 1)',

Top(TOP EXPRESSION:((20)))
  |--Clustered Index Seek(OBJECT:([basename].[dbo].[_DocumentJournal6640].[_Document6640_ByDocDate_TR] AS [T1]), SEEK:([T1].[_Date_Time]=[@P3] AND [T1].[_DocumentTRef]=[@P4] AND [T1].[_DocumentRRef] > [@P5]),  WHERE:([basename].[dbo].[_DocumentJournal6640].[_Date_Time] as [T1].[_Date_Time]>=[@P1] AND [basename].[dbo].[_DocumentJournal6640].[_Date_Time] as [T1].[_Date_Time]<=[@P2]) ORDERED FORWARD)